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For a field which is initially empty (such as the fields on the Create view) and which has only the required attribute and no other validation attributes, you can do the following to trigger validation: The above sequence will trigger the required validation without hitting the submit button.Simply hitting the submit button without entering any of the fields will trigger client side validation.
What's really nice about this approach is that neither the controller nor the Create view template knows anything about the actual validation rules being enforced or about the specific error messages displayed.
You'll begin by adding some validation logic to the The model backing the ' Movie DBContext' context has changed since the database was created. Code First ensures that the validation rules you specify on a model class are enforced before the application saves changes in the database.
Consider using Code First Migrations to update the database (https://go.microsoft.com/fwlink/? For example, the code below will throw an exception when the Having validation rules automatically enforced by the .
NET Framework helps make your application more robust.
It also ensures that you can't forget to validate something and inadvertently let bad data into the database.
Here's a complete code listing for the updated Notice how the form has automatically used a red border color to highlight the text boxes that contain invalid data and has emitted an appropriate validation error message next to each one.